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根据苏联施密特院士的学說,地球是由許多微細的塵埃逐漸聚集而成的。地球形成以后,由于放射性物質(如镭、鈾、钍等)不断放出能量,使得地球內部的溫度增高。灼热以后,地球內部的物質就按照密度的不同来分層,輕的上浮,重的下沉,这样便形成了矿脉和岩層。地壳就这样地生成了。地球的年龄一般是指地壳形成的年龄。过去有过許多种测定地球年龄的方法,但是最新的、最准确的方法是利用同位素来測定。
According to the Soviet Union Academician Schmidt’s doctrine, the Earth is formed by the gradual accumulation of many fine dusts. After the formation of the Earth, the internal temperature of the Earth has increased due to the constant release of energy from radioactive materials (such as radium, uranium, thorium, etc.). After burning, the material inside the earth is stratified according to different density, lightly floats, and sinks heavily. This forms veins and rock formations. The crust was generated like this. The age of the earth generally refers to the age of the crust. There have been many ways to measure the age of the earth in the past, but the latest and most accurate method is to use isotopes.